Empty program: Difference between revisions
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Not a robot (talk | contribs) (Add CLU) |
Puppydrum64 (talk | contribs) m (→Game Boy) |
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===Game Boy=== |
===Game Boy=== |
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{{trans|Game Boy Advance}} |
{{trans|Game Boy Advance}} |
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The Nintendo logo is loaded from the cartridge header, and the Game Boy's firmware won't boot the game without it. So a truly "empty" program can't be run at all. Thus a minimum of a valid cartridge header is required for an empty program that the Game Boy can actually run. |
The Nintendo logo is loaded from the cartridge header, and the Game Boy's firmware won't boot the game without it. In addition, the firmware also reads a checksum of the cartridge contents and won't boot the game if it doesn't match the checksum stored in the header. So a truly "empty" program can't be run at all. Thus a minimum of a valid cartridge header is required for an empty program that the Game Boy can actually run. |
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The beginning of the cartridge header is a jump to the program's start. |
The beginning of the cartridge header is a jump to the program's start. |
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<lang z80>ProgramStart: |
<lang z80>ProgramStart: |
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nop ;not sure if this is needed but Game Boy is somewhat buggy at times and the tutorials I used all did it |
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jp ProgramStart</lang> |
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di ;disable interrupts |
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foo: |
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jp foo ;trap the program counter here. (Don't do this on a real Game Boy, you'll drain the batteries much faster than usual.)</lang> |
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=={{header|Zig}}== |
=={{header|Zig}}== |
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